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Abstract

The system employs a composite video signal in which the sync pulses of such signal are modulated by the audio. Composite video signal 1 is applied to the base of an input transistor. The audio signal and bias 2 are applied to the base of another connecting transistor so that the sync pulses of signal 1 are modulated by the audio to produce video signal 3. At the receiving end, video signal 3 can be applied to the TV monitor. In addition, it is applied to the base of a transistor with the other connecting transistor having a bias 4 applied to it. This removes the video portion of the signal to produce a waveform shown as 5. This is then passed through a low-pass filter to produce audio output 6.

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United States

Language

English (United States)

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Transmitting Audio on a Composite TV Waveform

The system employs a composite video signal in which the sync pulses of
such signal are modulated by the audio. Composite video signal 1 is applied to
the base of an input transistor. The audio signal and bias 2 are applied to the
base of another connecting transistor so that the sync pulses of signal 1 are
modulated by the audio to produce video signal 3. At the receiving end, video
signal 3 can be applied to the TV monitor. In addition, it is applied to the base of
a transistor with the other connecting transistor having a bias 4 applied to it. This
removes the video portion of the signal to produce a waveform shown as 5. This
is then passed through a low-pass filter to produce audio output 6.